Suzie Skydiver jumps from a high-flying plane. As her velocity of fall increases, her acceleration
A) increases.
B) decreases.
C) remains unchanged regardless of air resistance.
Answer: B
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The coil of a generator rotates through one complete turn in a uniform magnetic field 50. times every second. When this generator is connected to an external load, the current through the load reverses directions
A) 25 times every second. B) 100 times every second. C) 75 times every second. D) 50 times every second. E) 200 times every second.
Two parallel conducting plates are separated by 1.0 mm and carry equal but opposite surface charge densities. If the potential difference between them is 2.0 V
what is the magnitude of the surface charge density on each plate? (?0 = 8.85 × 10-12 C2/N • m2) A) 18 nC/m2 B) 0.13 mC/m2 C) 35 nC/m2 D) 0.27 mC/m2
If a spherical convex mirror has a radius of curvature R, the magnitude of its focal length is
A) R/2. B) R/4. C) R. D) 2R. E) 4R.
An ideal solenoid is 18.5 cm long, has a circular cross-section 2.20 cm in diameter, and contains 545 equally spaced thin windings
This solenoid is connected in a series circuit with an open switch, a 15.0-? resistor, and a battery of internal resistance 5.00 ? and open-circuit terminal voltage of 25.0 V. (?0 = 4? × 10-7 T ? m/A) (a) What is the maximum amount of energy that the solenoid will store after closing the switch? (b) How long after closing the switch will it take for the stored energy in the solenoid to reach one-half of its maximum value? What will be an ideal response?